package com.ruoyi.web.controller.common;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileUploadUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.framework.config.ServerConfig;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyEmitter;
import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
import lombok.extern.slf4j.Slf4j;

/**
 * 通用请求处理
 *
 * @author ruoyi
 */
@RestController
@RequestMapping("/common")
@Slf4j // 添加 Lombok 的 @Slf4j 注解
public class CommonController
{
    @Autowired
    private ServerConfig serverConfig;



    private static final String FILE_DELIMETER = ",";

    // AI 对话的 API 地址（替换为实际的 API 地址）
    private static final String AI_API_URL = "https://api.deepseek.com/chat/completions";

    // AI API 的密钥（从配置文件中读取或直接填写）
    private static final String AI_API_KEY = "sk-4e6c200543be4be5ad05e4eebab8cc1b";

    private RestTemplate restTemplate = new RestTemplate(); // 注入 RestTemplate 用于发送 HTTP 请求

    @PostMapping("/ai/chat/stream")
    public SseEmitter aiChatStream(@RequestBody AiChatRequest request1) {
        SseEmitter emitter = new SseEmitter();
        log.info("ai聊天:{}", request1.getMessage());

        CompletableFuture.runAsync(() -> {
            try {
                HttpHeaders headers = new HttpHeaders();
                headers.setContentType(MediaType.APPLICATION_JSON);
                headers.set("Authorization", "Bearer " + AI_API_KEY);

                // 构建请求体，启用流式输出
                String requestBody = String.format(
                        "{\"model\": \"deepseek-chat\", \"messages\": [{\"role\": \"system\", \"content\": \"You are a helpful assistant.\"}, {\"role\": \"user\", \"content\": \"%s\"}], \"stream\": true}",
                        request1.getMessage()
                );

                HttpEntity<String> entity = new HttpEntity<>(requestBody, headers);

                // 发送请求并处理流式响应
                restTemplate.execute(AI_API_URL, HttpMethod.POST, request -> {
                    request.getHeaders().addAll(headers);
                    request.getBody().write(requestBody.getBytes(StandardCharsets.UTF_8));
                }, response -> {
                    try (BufferedReader reader = new BufferedReader(new InputStreamReader(response.getBody(), StandardCharsets.UTF_8))) {
                        String line;
                        while ((line = reader.readLine()) != null) {
                            if (line.startsWith("data:")) {
                                String data = line.substring(5).trim();
                                if (data.equals("[DONE]")) {
                                    // 处理结束标志
                                    emitter.complete();
                                    break;
                                }
                                emitter.send(data); // 发送 SSE 数据
                            }
                        }
                    } catch (Exception e) {
                        emitter.completeWithError(e); // 发生错误时结束流式响应
                    }
                    return null;
                });
            } catch (Exception e) {
                emitter.completeWithError(e); // 发生错误时结束流式响应
            }
        });

        log.info("聊天结果:{}", emitter);
        return emitter;
    }

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete 是否删除
     */
    @GetMapping("/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response, HttpServletRequest request)
    {
        try
        {
            if (!FileUtils.checkAllowDownload(fileName))
            {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = RuoYiConfig.getDownloadPath() + fileName;

            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, realFileName);
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete)
            {
                FileUtils.deleteFile(filePath);
            }
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求（单个）
     */
    @PostMapping("/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("url", url);
            ajax.put("fileName", fileName);
            ajax.put("newFileName", FileUtils.getName(fileName));
            ajax.put("originalFilename", file.getOriginalFilename());
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 通用上传请求（多个）
     */
    @PostMapping("/uploads")
    public AjaxResult uploadFiles(List<MultipartFile> files) throws Exception
    {
        try
        {
            // 上传文件路径
            String filePath = RuoYiConfig.getUploadPath();
            List<String> urls = new ArrayList<String>();
            List<String> fileNames = new ArrayList<String>();
            List<String> newFileNames = new ArrayList<String>();
            List<String> originalFilenames = new ArrayList<String>();
            for (MultipartFile file : files)
            {
                // 上传并返回新文件名称
                String fileName = FileUploadUtils.upload(filePath, file);
                String url = serverConfig.getUrl() + fileName;
                urls.add(url);
                fileNames.add(fileName);
                newFileNames.add(FileUtils.getName(fileName));
                originalFilenames.add(file.getOriginalFilename());
            }
            AjaxResult ajax = AjaxResult.success();
            ajax.put("urls", StringUtils.join(urls, FILE_DELIMETER));
            ajax.put("fileNames", StringUtils.join(fileNames, FILE_DELIMETER));
            ajax.put("newFileNames", StringUtils.join(newFileNames, FILE_DELIMETER));
            ajax.put("originalFilenames", StringUtils.join(originalFilenames, FILE_DELIMETER));
            return ajax;
        }
        catch (Exception e)
        {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/download/resource")
    public void resourceDownload(String resource, HttpServletRequest request, HttpServletResponse response)
            throws Exception
    {
        try
        {
            if (!FileUtils.checkAllowDownload(resource))
            {
                throw new Exception(StringUtils.format("资源文件({})非法，不允许下载。 ", resource));
            }
            // 本地资源路径
            String localPath = RuoYiConfig.getProfile();
            // 数据库资源地址
            String downloadPath = localPath + StringUtils.substringAfter(resource, Constants.RESOURCE_PREFIX);
            // 下载名称
            String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, downloadName);
            FileUtils.writeBytes(downloadPath, response.getOutputStream());
        }
        catch (Exception e)
        {
            log.error("下载文件失败", e);
        }
    }

    /**
     * AI 对话接口
     *
     * @param request 包含用户输入的消息
     * @return AI 的回复
     */
    @PostMapping("/ai/chat")
    public AjaxResult aiChat(@RequestBody AiChatRequest request) {
        try {
            // 构建请求头
            HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_JSON);
            headers.set("Authorization", "Bearer " + AI_API_KEY);

            // 构建请求体
            String requestBody = String.format("{\"model\": \"gpt-3.5-turbo\", \"messages\": [{\"role\": \"user\", \"content\": \"%s\"}]}", request.getMessage());

            // 发送请求
            HttpEntity<String> entity = new HttpEntity<>(requestBody, headers);
            ResponseEntity<String> response = restTemplate.exchange(AI_API_URL, HttpMethod.POST, entity, String.class);

            // 解析 AI 的回复
            String aiResponse = response.getBody();

            // 返回结果
            return AjaxResult.success("AI 回复成功", aiResponse);
        } catch (Exception e) {
            log.error("AI 对话失败", e);
            return AjaxResult.error("AI 对话失败: " + e.getMessage());
        }
    }

    /**
     * AI 对话请求体
     */
    public static class AiChatRequest {
        private String message;

        public String getMessage() {
            return message;
        }

        public void setMessage(String message) {
            this.message = message;
        }
    }
}
